1. A 15.0 sample of a compound is found to contain 8.83 grams of sodium and 16.7 grams of sulfur. Calculate the empirical formula of this compound.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf